> I need to check whether there is a water flow in a 1" rubber pipe.

You have about 10 cm/sec liquid speed (2000l/h 25.4mm diameter) which may
be too slow for a wheel type sensor. Could you use a heat transport sensor
? Would it have to stop and start very quickly (the heat transport sensor
cannot do that) ?

Peter

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics